O.S 15650 .55HZ-R DRS Ring 40L-R

This is the Limited Edition OS 55HZ-R DRS Ringed Helicopter Engine with the DRS (Demand Regulator System).

Features

• O.S 15650 .55HZ-R DRS Ring 40L-R

• DRS system delivers fuel to the regulator under constant pressure for precise fuel delivery throughout the entire tank from full to empty

• Mounting position of DRS is perfectly in line with the carb for consistent operation in all attitudes of flight

• Same mounting bolt pattern as the OS 50SX-H Hyper

• Dual needle 40L-R carburetor allows independent adjustment of idling, hovering and high speed with four arm throttle lever for use with a variety of servo brands

• HZ Hyper low profile six fin cylinder head

• Two year limited warranty through Hobby Services beginning at the date of purchase

Specifications

•   Engine;

• Displacement: 0.55 cu in (8.93cc)

• Bore: 0.91" (23mm)

• Stroke: 0.85" (23.5mm)

• Practical RPM: 2,000-20,000 RPM

• Weight: 15.1oz (429g)

• Carburetor Settings:

•   High Speed Needle Valve, Approximately two turns open from fully closed position

•   Idle Mixture Control Screw, Factory set at center, turn right to richen or left to lean mixture

•   Medium Speed Needle Valve, One turn open from fully closed, adjust only after setting high speed needle and idle mixture screw, do not turn more than 90° right or left

• Distance/top of cylinder head-bottom of mounting tabs: 2.8" (72.6mm)

• Distance between mounting holes same side: 0.68" (17.5mm)

• Distance between mounting holes opposite side: 1.73" (44mm)

• Distance between muffler mounting holes: 1.4" (37mm)

• Cylinder Head Diameter: 1.8" (47mm)

• Distance/bottom of crankcase to top of cylinder head: 3.6" (90.9mm)

• Distance from center of engine to front bearing: 2.03" (51.6mm)

• Distance from center of engine to end of Crankshaft: 3.2" (82.6mm)

• Distance from center of engine to backplate bolt: 0.98" (25mm)

• Distance from center of engine to throttle lever: 1.5" (38mm)

Contents

• OS 55HZ-R DRS Ringed Helicopter Engine, #8 Glow Plug, Check Valve and Instruction Manual

Requirements

• 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)

• Fuel filter and starting equipment